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1977 280z the last year of externally regulated alternators for the z cars. Over the winter I purchased some parts for the cars, one of which was the 60amp zx internally regulated alternator from Zcardepot to gain the reliability on the integrated voltage regulator .
This is a common swap that I am sure has been done a thousand times or more. Of course, after removing my perfectly functional externally regulated alternator and installing the new one - no charge output. I used Blue's well documented wiring diagram to unplug the regulator and make the connections on the 6 pin harness connector to jumper sense line and complete the circuit. Pins 1 to 5 and 2 to 3 according to the 77 wiring diagram.
When this is done, the alternator output is the nominal battery voltage ( about12.8 to 13v) obviously not charging. I verified all the wiring and connections, the color code of the harness plug matches exactly to the atlantic z diagram. Also when pins 1-5 are connected, the charge warning light on the volt gauge comes on.
For fun, I removed the jumpers and plugged back in the external regulator - it now charges, looks like overcharges 14.8 - 15.5v
Its looking to me like I may have to uninstall the new one, take it to Oriellys to have it tested and go from there.
Other than a bad alternator or a externally reg one put in the wrong box, anyone have any further suggestions to try and correct the issue or possibly I have missed something...
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